There are companies out there who are willing to take on developers like yourself who are experienced in a programming language, and cross-train you into a new one. Or you could consider a company that has a varied tech stack, where you'll use e.g JavaScript plus learn their other languages on the job. I think many businesses are realising that the concepts and skills shared between languages are more important than specific languages themselves. That being said, Go is a little bit different to most OOP languages I think...